Spark-plug.



s. w. HYATT.

SPARK PLUG.

APPLICATION FILED JULY 30,1918- 1,325,403. Patented Dec.16, 1919.

I! l l 14 Jvwewto z LAN SAMUEL W. HYATT, OF COLUMBUS, UHID, ASSIGN'OR HY.1T IGNITION GDMEANY.

SPARK-IELUG.

menace.

Application filed July 30. 1918.

To aZZ whom it may concern:

Be it known that I, SAMUEL W. l-lrn'i"r, a citizen of the United States, residing at Columbus, in the county of Franklin and State of Ohio, have invented new and useful Improvements in S iiai-loPlugs, of which the following is a specification,

This invention has reference generally to improvements in that class oi inventions? I contact with the insulator and electrodes thereby eliminating any possible chan 388 of carbon formation on the sparking points which would cause a short circuit.

More particularly the present invention contemplates the provison of a device of the above mentioned character wherein the electrodesor poles are designed to provide two or more spark gapsconsequently ijitfllllt ing an intensified. spark at the sparking points and in addition these electrodes are of such construction that they are foul proof when in use.

It is an additional object of this invention .to provide a device of the above mentioned character which is simple in construction,

thoroughly reliable and eilicient in its purpose and inexpensive in manufacture.

Other objects will be in part obvious and in part hereinafter set forth.

The invention accordingly consists in the features of construction, the combination of elements and the arrangement of parts in the construction hereinafter described. and the scope of the application of which is indicated in the appended claim.

The invention is clearly illustratec in the accompanying drawings, in which Figure 1 is a vertical central section of theinvention partly in elevation.

Fig. 2' is-a bottom plan view thereof.

Fig. 3 is a vertical sectional detail ot another form of the invention partly in elevation.

Fig. 4 is a bottom plan view thereof.

Similar characters of reference are emloyed in all of the above described views, to indicate corresponding parts.

Specification of Letters Patent. g atented Dec t6.

Serial No. 2475230.

Ide'ferring now, more particularly to the accompanying drawings there is provided a metallic casing indicated generally by the numeral 1 being preferably of a tubular configuration and having its lower portion reduced and exteriorly threaded as at 2 for facilitating the attachment of the spark pluo in the customary manner. T he reducing 01. the casing provides an. interior annular shoulder 23 therein while mounted within the casing is an insulator body generallv designated t formed with an enlargement 5 approxm'uitey medially of its ends and this enlargement in turn provides the shoulders 6 and 7, the lower of which rests upon a copper gasket 8 which in turn engages the shoulder 3 hile engaging; agi-iinst the upper surface of the upper shoulder 7 is an other gasket 9 preterably of copper. Cooperating with the gaskets and removablv yet rigidly holding the insulator body "in a proper position within the casing is an exteriorly threaded bushing 10 which engages the interior threads near the upper portion or the c: ng and acts as a jam nut, as indicated. t/arricd within the insulator body is a pole or central electrode L1 the lower end of which proiects slightly beneath the lower edge of the body and terms a spark terminal 12. while the upper end extends above the insulator body and is threaded as at 13 for accommodating the lock nut 14- and a binding terminal 15. Cooperating with the sparking terminal 12 of the electrode 11 is the ground electrode indicated generallyby the numeral 16, this electrode 16 extends from the lower edge of the casing and has a portion 17 bent at-right angles to the main portion and arranged in suitable spaced relation with the under surface of the sparkin g point 12 to provide a spark gap 18, while the outer portion is hent upwardly and inwardly as 2G to provide another spark 111;! point wi-iich is arranged in close relation with one side oi the sparking point 12 of the centr el c rode 11 the space tl'ierehetwecn providing another spark gap 21.

lly the provision of this peculiar con struction it is to be observed that two sparkmg gaps 18 and :21 are provided between the two electrodes 11 and 16 and prevents the spark plug from fouling because either one of the gaps will fire should the other hecome foul to consequently insure of the burning oil of any oil or carbon that might lodge between the two gaps. Moreover by K ll Elli) this peculiar construction a magnetic field is built around the firing point or gap that so intensifies the spark as to produce a high frequency spark.

In Figs. 8 and a there is shown a slightly modified form of the invention. In reducing this featureof the invention to practice, instead of employing the ground electrode 16, another ground electrode indicated generally by the numeral 22 is employed and consists of a body formed from a single piece of wire the intermediate portion of which is bent into a substantially U-shaped configuration and consists of a relatively flat medial portion 23 and relatively and inwardly inclined arms 24 which are joined at an angle with the side portions 25 of the body' so as. to provide opposed sparking points 26 which are arranged upon opposite sides and in suitable spaced relation with the sparking point 27 of the central electrode 28 carried in the insulator body of a construction similar to the insulator body 4. In this connection it is to be noticed that the outer end of the sparking point is suitably spaced to the medial portion 23 to provide another spark gap. Finally the terminals 29 of the body are anchored in opposite points in the lower edge of the casing 30 which is of a construction snnllar to the casing 1. It will thus be seen that three sparking gaps are provided by the use of this ground electrode 22 in conjunction with the central stationary electrode 28 and owing to the peculiar arrangement of these electrodes the accumulation of carbon thereon, which causes a short circuit or 'miss firing, is obviated and in addition the magnetic field built up around the firing points or gaps so intensifies the spark as to produce a high frequency spark.

It is thought in view of the foregoing description that a further detailed description of the operation of the invention is entirely unnecessary. Likewise it is believed that the advantages of the invention will be readily apparent.

As many changes could be made in the above construction and many apparently widely different embodiments of this invention could be made without departing from body therein, a central electrode carried within the body and projecting beneath the lower edge thereof to provide a sparking point, a ground electrode carried with and depending from the lower edge of the easing and having a portion bent at right angles to the main portion and positioned in suitable spaced relation beneath the spark: ing point to provide a spark gap, the outer portion of the grmmd electrode being bent upwardly,- and a contact terminal extending from the upper portion and arranged in suitable spaced relation with theside of the first mentioned sparking point to provide another spark gap between the two electrodes.

In testimony whereoi I attixmy signature.

- SAMUEL W. HYATT. 

